High Integrity System Test Bed (HISTB): The Preliminary Step to EGNOS Dual Frequency/Multi-constellation Evolution

H. Delfour, J.A. Gicquel, P. Larhantec, D. Joly, D. Lekaim, M. Jeannot

Abstract:	In the frame of the "European GNSS Evolution Program" (EGEP), ESA is preparing the next version of EGNOS. This project is currently in its definition phase, with the aim of consolidating the definition and the deployment strategy. In parallel, in order to bring more confidence in simulations results, including notably field testing, Test Beds are developed in the frame of EGEP. Among them, High Integrity System Test Bed (HISTB) is designed to assess future EGNOS services for aeronautical users. This project has been divided in two phases: first phase has finished end 2013, with a first set of results available, whereas second phase is currently running with new activities under implementation. The experimentations done up to end 2013 have provided the following results: • The feasibility of SBAS algorithms to process future GPS frequencies (L1 with L2C or L5) is ensured. These results validate the capability to handle next GPS generation to provide EGNOS legacy service. • SBAS algorithms are able to process dual-frequency / dual-constellation data. • Tests with GPS and Galileo simulated data show the interest of using both constellations. • The first SBAS augmentation of real Galileo IOV satellites has also been performed, already showing the benefit of it. • Finally, it has been shown that a SBAS configured by using GPS and Galileo is robust to the loss of Galileo constellation, in particular without loss of integrity. The new aspects developed in this paper are the on-going HISTB activities (second phase of the project since beginning 2014): • Consolidate initial results by studying, for the legacy service, the transition from the current EGNOS service (based only on L1/L2P frequencies) to the future EGNOS service (based on L1 and a mix of L2P, L2C and L5) • Assess the impact on performances of the relaxed refresh rate of satellite corrections introduced by the new SBAS L5 standard [4] (in its current draft version). • Develop an independent integrity check for GPS/Galileo configurations and assess its performance. This is the continuation of the first phase where GPS/Galileo simulations have been done without this independent check. • Perform a demonstration with an aircraft to show the interest of dual frequency and dual constellation augmentation system.
Published in:	Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014) September 8 - 12, 2014 Tampa Convention Center Tampa, Florida
Pages:	3263 - 3269
Cite this article:	Delfour, H., Gicquel, J.A., Larhantec, P., Joly, D., Lekaim, D., Jeannot, M., "High Integrity System Test Bed (HISTB): The Preliminary Step to EGNOS Dual Frequency/Multi-constellation Evolution," Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014), Tampa, Florida, September 2014, pp. 3263-3269.
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